Manually disabling "Nagle's Algorithm" in the Windows Registry or updating your network card drivers can significantly reduce ping.
Switching from Wi-Fi to an Ethernet cable is the single most effective way to stabilize your latency.
Most optimization software offers a free trial or a "Lite" version that allows you to test the features safely.
Tools like TCP Optimizer are completely free, open-source, and highly effective at tuning your internet connection.